Do you have proof? Did you know him personally? Did you witness what went on in his bedroom? Did you have a camera... recording his bedroom activities?
If not, you cannot say MJ was a paedophile and state it as fact.

Prior to 1993 was it known he slept with boys as young as 7 who were on their own with him?

Was 2003 the first time he publicly admitted sleeping with young boys, but even then he was only 'sharing' ie giving up his bed for young boys.